NEW YORK, Nov 21- Middleby Corp, maker of high-end kitchen appliances for both professional and home cooks, has become a new favorite of fund managers as it benefits from changing American dining habits. That push away from Big Macs has spurred Middleby's revenue growth, which hit 14 percent in its current fiscal year, and prompted 81 mutual funds, including those...

Nov 6- Wendy's Co, the No. 3 U.S. hamburger chain, reported quarterly sales and profit below analysts' estimates, mostly due to higher beef costs and intense competition in North America. Wendy's, like market leader McDonald's Corp, has been struggling in an increasingly competitive fast-food market and has been investing heavily to spruce up its restaurants and...